diff --git a/BUILD b/BUILD
index 2eadff1f..45ad652f 100644
--- a/BUILD
+++ b/BUILD
@@ -292,6 +292,8 @@ proto_library(
         "//envoy/extensions/network/dns_resolver/cares/v3:pkg",
         "//envoy/extensions/network/dns_resolver/getaddrinfo/v3:pkg",
         "//envoy/extensions/network/socket_interface/v3:pkg",
+        "//envoy/extensions/outlier_detection_monitors/common/v3:pkg",
+        "//envoy/extensions/outlier_detection_monitors/consecutive_errors/v3:pkg",
         "//envoy/extensions/path/match/uri_template/v3:pkg",
         "//envoy/extensions/path/rewrite/uri_template/v3:pkg",
         "//envoy/extensions/quic/connection_id_generator/v3:pkg",
diff --git a/envoy/config/cluster/v3/outlier_detection.proto b/envoy/config/cluster/v3/outlier_detection.proto
index 11289e26..622486e4 100644
--- a/envoy/config/cluster/v3/outlier_detection.proto
+++ b/envoy/config/cluster/v3/outlier_detection.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package envoy.config.cluster.v3;
 
+import "envoy/config/core/v3/extension.proto";
+
 import "google/protobuf/duration.proto";
 import "google/protobuf/wrappers.proto";
 
@@ -19,7 +21,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 
 // See the :ref:`architecture overview <arch_overview_outlier_detection>` for
 // more information on outlier detection.
-// [#next-free-field: 24]
+// [#next-free-field: 25]
 message OutlierDetection {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.api.v2.cluster.OutlierDetection";
@@ -167,4 +169,8 @@ message OutlierDetection {
   // To change this default behavior set this config to ``false`` where active health checking will not uneject the host.
   // Defaults to true.
   google.protobuf.BoolValue successful_active_health_check_uneject_host = 23;
+
+  // Set of host's passive monitors.
+  // [#not-implemented-hide:]
+  repeated core.v3.TypedExtensionConfig monitors = 24;
 }
diff --git a/envoy/extensions/outlier_detection_monitors/common/v3/BUILD b/envoy/extensions/outlier_detection_monitors/common/v3/BUILD
new file mode 100644
index 00000000..ef19132f
--- /dev/null
+++ b/envoy/extensions/outlier_detection_monitors/common/v3/BUILD
@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/type/v3:pkg",
+        "@com_github_cncf_xds//udpa/annotations:pkg",
+    ],
+)
diff --git a/envoy/extensions/outlier_detection_monitors/common/v3/error_types.proto b/envoy/extensions/outlier_detection_monitors/common/v3/error_types.proto
new file mode 100644
index 00000000..7ea14dde
--- /dev/null
+++ b/envoy/extensions/outlier_detection_monitors/common/v3/error_types.proto
@@ -0,0 +1,44 @@
+syntax = "proto3";
+
+package envoy.extensions.outlier_detection_monitors.common.v3;
+
+import "envoy/type/v3/range.proto";
+
+import "udpa/annotations/status.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.outlier_detection_monitors.common.v3";
+option java_outer_classname = "ErrorTypesProto";
+option java_multiple_files = true;
+option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/outlier_detection_monitors/common/v3;commonv3";
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Outlier detection error buckets]
+// Error bucket for HTTP codes.
+// [#not-implemented-hide:]
+message HttpErrors {
+  type.v3.Int32Range range = 1;
+}
+
+// Error bucket for locally originated errors.
+// [#not-implemented-hide:]
+message LocalOriginErrors {
+}
+
+// Error bucket for database errors.
+// Sub-parameters may be added later, like malformed response, error on write, etc.
+// [#not-implemented-hide:]
+message DatabaseErrors {
+}
+
+// Union of possible error buckets.
+// [#not-implemented-hide:]
+message ErrorBuckets {
+  // List of buckets "catching" HTTP codes.
+  repeated HttpErrors http_errors = 1;
+
+  // List of buckets "catching" locally originated errors.
+  repeated LocalOriginErrors local_origin_errors = 2;
+
+  // List of buckets "catching" database errors.
+  repeated DatabaseErrors database_errors = 3;
+}
diff --git a/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/BUILD b/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/BUILD
new file mode 100644
index 00000000..60022c6b
--- /dev/null
+++ b/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/BUILD
@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/extensions/outlier_detection_monitors/common/v3:pkg",
+        "@com_github_cncf_xds//udpa/annotations:pkg",
+    ],
+)
diff --git a/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/consecutive_errors.proto b/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/consecutive_errors.proto
new file mode 100644
index 00000000..8c74f6b5
--- /dev/null
+++ b/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3/consecutive_errors.proto
@@ -0,0 +1,34 @@
+syntax = "proto3";
+
+package envoy.extensions.outlier_detection_monitors.consecutive_errors.v3;
+
+import "envoy/extensions/outlier_detection_monitors/common/v3/error_types.proto";
+
+import "google/protobuf/wrappers.proto";
+
+import "udpa/annotations/status.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.outlier_detection_monitors.consecutive_errors.v3";
+option java_outer_classname = "ConsecutiveErrorsProto";
+option java_multiple_files = true;
+option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/outlier_detection_monitors/consecutive_errors/v3;consecutive_errorsv3";
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// Monitor which counts consecutive errors.
+// If number of consecutive errors exceeds the threshold, monitor will report that the host
+// is unhealthy.
+// [#not-implemented-hide:]
+message ConsecutiveErrors {
+  // Monitor name.
+  string name = 1;
+
+  // The number of consecutive errors before ejection occurs.
+  google.protobuf.UInt32Value threshold = 2 [(validate.rules).uint32 = {lte: 100}];
+
+  // The % chance that a host is actually ejected. Defaults to 100.
+  google.protobuf.UInt32Value enforcing = 3 [(validate.rules).uint32 = {lte: 100}];
+
+  // Error buckets.
+  common.v3.ErrorBuckets error_buckets = 4;
+}
diff --git a/versioning/BUILD b/versioning/BUILD
index 706d7d6f..edb89aa6 100644
--- a/versioning/BUILD
+++ b/versioning/BUILD
@@ -231,6 +231,8 @@ proto_library(
         "//envoy/extensions/network/dns_resolver/cares/v3:pkg",
         "//envoy/extensions/network/dns_resolver/getaddrinfo/v3:pkg",
         "//envoy/extensions/network/socket_interface/v3:pkg",
+        "//envoy/extensions/outlier_detection_monitors/common/v3:pkg",
+        "//envoy/extensions/outlier_detection_monitors/consecutive_errors/v3:pkg",
         "//envoy/extensions/path/match/uri_template/v3:pkg",
         "//envoy/extensions/path/rewrite/uri_template/v3:pkg",
         "//envoy/extensions/quic/connection_id_generator/v3:pkg",